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5×(9-8+7-6+5-4+3-2+1)×8=

Răspuns :

5x(9-8+7-6+5-4+3-2+1)x8=
5x(1+7-6+5-4+3-2+1)x8=
5x(8-6+5-4+3-2+1)x8=
5x(2+5-4+3-2+1)x8=
5x(7-4+3-2+1)x8=
5x(3+3-2+1)x8=
5x(6-2+1)x8=
5x(4+1)x8=
5x5x8=
25x8=200